We're running Groupshield 7.0.1 on a Windows 2003 Server with Exchange 2003. Its generally working fine but quite a few emails with dodgy attachments are still getting through.

These are all executables within zip files so I've been trying to block these without success. File Filtering was not enabled so I turned this on but I can't make it work at all. I've tried using filename filtering (using *.zip to test) and also file category filtering (tested with both executables and compressed files) separately as I know there are issues using both in the same rule but whenever I send a zipped executable it is passed through as clean.

As far as I can tell File Filtering is not working at all and not blocking any attachments. Any ideas what might be needed to get this working and whether there is an easy way in Groupshield to block zipped executables (not convinced that file filtering scans inside zips).

Well I have to remind you that Groupshield (all versions) went EOL\EOS yesterday.

But to get this running - create file filter rules in shared resources as you described - but when you enabled file filtering did you apply those rules you created to the OnAccess Master Policy and set them to repleace or delete etc??